@unpublished{repository3554,
           title = {Laporan Penelitian Mandiri (COVID-19)},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/3554/},
          author = {wijiharjono, Nuryadi and Rachman, Nur Hadiyazid and Chandra, Dicky and Tutuko, Bambang}
}